4-15N-2,3,5-Trimethylpyrazine (A) was synthesized by dechlorination of 4-15N-6-chloro-2,3,5-trimethylpyrazine (I), the key intermediate, derived from 15N-D~alanine (a). 1-15N-2, 3,5-Trimethylpyrazine (2) was prepared by decarboxylation of 1-15N-2,3,5-trimethyl-pyrazine-6- carboxylic acid (10) obtai
Synthesis of [4-15NH2]- and [1,3-15N2]cytidine derivatives for use in NMR-monitored binding tests
β Scribed by Chien-Hua Niu
- Publisher
- Elsevier Science
- Year
- 1984
- Tongue
- English
- Weight
- 330 KB
- Volume
- 139
- Category
- Article
- ISSN
- 0003-2697
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β¦ Synopsis
The conversion of 15N-enriched urea to a [1,3-15N2]cytidine derivative is accomplished in nine steps with an overall yield of 67%. Synthesis of a [4-15NH2]cytidine derivative is achieved by thiolation of the corresponding uridine derivative with Lawesson's reagent and amination with 15N-enriched ammonia in a sealed glass vessel.
π SIMILAR VOLUMES
Gradient-Enhanced Inverse-Detected NMR Techniques for Determination of 1 H-15 N Coupling Constants in 2,2-Dimethylpenta-3,4-dienal Derivatives -[such as (I) and (II)]. -(MAREK, R.; Collect. Czech.
## Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a βFull Textβ option. The original article is trackable v
## Abstract Various [5,6]pyrano[2,3β__c__]pyrazolβ4(1__H__)βthiones were synthesized in high yields by treatment of the corresponding [5,6]pyrano[2,3β__c__]pyrazolβ4(1__H__)βones with Lawesson's reagent. Detailed NMR spectroscopic studies were undertaken of the title compounds. Complete and unambig
The assignment of the diazo site in products of the reaction of p-toluenesulfonylhydrazine with b-lapachone, 3,4-dihydro-2,2-dimethyl-2H-naphtho[1,2-b]pyran-5,6-dione, and other 1,2-naphthoquinones in methanol solution at room temperature has been accomplished using 1 H, 13 C HMBC and 1 H, 15 N HMBC